/**
 * @file
 * Management Information Base II (RFC1213) objects and functions.
 *
 * @note the object identifiers for this MIB-2 and private MIB tree
 * must be kept in sorted ascending order. This to ensure correct getnext operation.
 */

/*
 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * Author: Christiaan Simons <christiaan.simons@axon.tv>
 */

#include "lwip/opt.h"

#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */

#include "lwip/snmp.h"
#include "lwip/netif.h"
#include "lwip/ip.h"
#include "lwip/ip_frag.h"
#include "lwip/tcp.h"
#include "lwip/udp.h"
#include "lwip/snmp_asn1.h"
#include "lwip/snmp_structs.h"
#include "netif/etharp.h"

/**
 * IANA assigned enterprise ID for lwIP is 26381
 * @see http://www.iana.org/assignments/enterprise-numbers
 *
 * @note this enterprise ID is assigned to the lwIP project,
 * all object identifiers living under this ID are assigned
 * by the lwIP maintainers (contact Christiaan Simons)!
 * @note don't change this define, use snmp_set_sysobjid()
 *
 * If you need to create your own private MIB you'll need
 * to apply for your own enterprise ID with IANA:
 * http://www.iana.org/numbers.html
 */
#define SNMP_ENTERPRISE_ID 26381
#define SNMP_SYSOBJID_LEN 7
#define SNMP_SYSOBJID { 1, 3, 6, 1, 4, 1, SNMP_ENTERPRISE_ID }

#ifndef SNMP_SYSSERVICES
#define SNMP_SYSSERVICES ((1 << 6) | (1 << 3) | ((IP_FORWARD) << 2))
#endif

#ifndef SNMP_GET_SYSUPTIME
#define SNMP_GET_SYSUPTIME(sysuptime)
#endif

static void system_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void system_get_value(struct obj_def *od, u16_t len, void *value);
static u8_t system_set_test(struct obj_def *od, u16_t len, void *value);
static void system_set_value(struct obj_def *od, u16_t len, void *value);
static void interfaces_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void interfaces_get_value(struct obj_def *od, u16_t len, void *value);
static void ifentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void ifentry_get_value(struct obj_def *od, u16_t len, void *value);
#if !SNMP_SAFE_REQUESTS
static u8_t ifentry_set_test(struct obj_def *od, u16_t len, void *value);
static void ifentry_set_value(struct obj_def *od, u16_t len, void *value);
#endif /* SNMP_SAFE_REQUESTS */
static void atentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void atentry_get_value(struct obj_def *od, u16_t len, void *value);
static void ip_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void ip_get_value(struct obj_def *od, u16_t len, void *value);
static u8_t ip_set_test(struct obj_def *od, u16_t len, void *value);
static void ip_addrentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void ip_addrentry_get_value(struct obj_def *od, u16_t len, void *value);
static void ip_rteentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void ip_rteentry_get_value(struct obj_def *od, u16_t len, void *value);
static void ip_ntomentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void ip_ntomentry_get_value(struct obj_def *od, u16_t len, void *value);
static void icmp_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void icmp_get_value(struct obj_def *od, u16_t len, void *value);
#if LWIP_TCP
static void tcp_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void tcp_get_value(struct obj_def *od, u16_t len, void *value);
#ifdef THIS_SEEMS_UNUSED
static void tcpconnentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void tcpconnentry_get_value(struct obj_def *od, u16_t len, void *value);
#endif
#endif
static void udp_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void udp_get_value(struct obj_def *od, u16_t len, void *value);
static void udpentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void udpentry_get_value(struct obj_def *od, u16_t len, void *value);
static void snmp_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
static void snmp_get_value(struct obj_def *od, u16_t len, void *value);
static u8_t snmp_set_test(struct obj_def *od, u16_t len, void *value);
static void snmp_set_value(struct obj_def *od, u16_t len, void *value);


/* snmp .1.3.6.1.2.1.11 */
const mib_scalar_node snmp_scalar = {
    &snmp_get_object_def,
    &snmp_get_value,
    &snmp_set_test,
    &snmp_set_value,
    MIB_NODE_SC,
    0
};
const s32_t snmp_ids[28] = {
    1,  2,  3,  4,  5,  6,  8,  9,  10, 11, 12, 13, 14, 15, 16,
    17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30
};
struct mib_node* const snmp_nodes[28] = {
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar,
    (struct mib_node*const)&snmp_scalar, (struct mib_node*const)&snmp_scalar
};
const struct mib_array_node snmp = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    28,
    snmp_ids,
    snmp_nodes
};

/* dot3 and EtherLike MIB not planned. (transmission .1.3.6.1.2.1.10) */
/* historical (some say hysterical). (cmot .1.3.6.1.2.1.9) */
/* lwIP has no EGP, thus may not implement it. (egp .1.3.6.1.2.1.8) */

/* udp .1.3.6.1.2.1.7 */
/** index root node for udpTable */
struct mib_list_rootnode udp_root = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_LR,
    0,
    NULL,
    NULL,
    0
};
const s32_t udpentry_ids[2] = { 1, 2 };
struct mib_node* const udpentry_nodes[2] = {
    (struct mib_node*const)&udp_root, (struct mib_node*const)&udp_root,
};
const struct mib_array_node udpentry = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    2,
    udpentry_ids,
    udpentry_nodes
};

s32_t udptable_id = 1;
struct mib_node* udptable_node = (struct mib_node*const)&udpentry;
struct mib_ram_array_node udptable = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_RA,
    0,
    &udptable_id,
    &udptable_node
};

const mib_scalar_node udp_scalar = {
    &udp_get_object_def,
    &udp_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_SC,
    0
};
const s32_t udp_ids[5] = { 1, 2, 3, 4, 5 };
struct mib_node* const udp_nodes[5] = {
    (struct mib_node*const)&udp_scalar, (struct mib_node*const)&udp_scalar,
    (struct mib_node*const)&udp_scalar, (struct mib_node*const)&udp_scalar,
    (struct mib_node*const)&udptable
};
const struct mib_array_node udp = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    5,
    udp_ids,
    udp_nodes
};

/* tcp .1.3.6.1.2.1.6 */
#if LWIP_TCP
/* only if the TCP protocol is available may implement this group */
/** index root node for tcpConnTable */
struct mib_list_rootnode tcpconntree_root = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_LR,
    0,
    NULL,
    NULL,
    0
};
const s32_t tcpconnentry_ids[5] = { 1, 2, 3, 4, 5 };
struct mib_node* const tcpconnentry_nodes[5] = {
    (struct mib_node*const)&tcpconntree_root, (struct mib_node*const)&tcpconntree_root,
    (struct mib_node*const)&tcpconntree_root, (struct mib_node*const)&tcpconntree_root,
    (struct mib_node*const)&tcpconntree_root
};
const struct mib_array_node tcpconnentry = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    5,
    tcpconnentry_ids,
    tcpconnentry_nodes
};

s32_t tcpconntable_id = 1;
struct mib_node* tcpconntable_node = (struct mib_node*const)&tcpconnentry;
struct mib_ram_array_node tcpconntable = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_RA,
/** @todo update maxlength when inserting / deleting from table
   0 when table is empty, 1 when more than one entry */
    0,
    &tcpconntable_id,
    &tcpconntable_node
};

const mib_scalar_node tcp_scalar = {
    &tcp_get_object_def,
    &tcp_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_SC,
    0
};
const s32_t tcp_ids[15] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
struct mib_node* const tcp_nodes[15] = {
    (struct mib_node*const)&tcp_scalar,   (struct mib_node*const)&tcp_scalar,
    (struct mib_node*const)&tcp_scalar,   (struct mib_node*const)&tcp_scalar,
    (struct mib_node*const)&tcp_scalar,   (struct mib_node*const)&tcp_scalar,
    (struct mib_node*const)&tcp_scalar,   (struct mib_node*const)&tcp_scalar,
    (struct mib_node*const)&tcp_scalar,   (struct mib_node*const)&tcp_scalar,
    (struct mib_node*const)&tcp_scalar,   (struct mib_node*const)&tcp_scalar,
    (struct mib_node*const)&tcpconntable, (struct mib_node*const)&tcp_scalar,
    (struct mib_node*const)&tcp_scalar
};
const struct mib_array_node tcp = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    15,
    tcp_ids,
    tcp_nodes
};
#endif

/* icmp .1.3.6.1.2.1.5 */
const mib_scalar_node icmp_scalar = {
    &icmp_get_object_def,
    &icmp_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_SC,
    0
};
const s32_t icmp_ids[26] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 };
struct mib_node* const icmp_nodes[26] = {
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar,
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar,
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar,
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar,
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar,
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar,
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar,
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar,
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar,
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar,
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar,
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar,
    (struct mib_node*const)&icmp_scalar, (struct mib_node*const)&icmp_scalar
};
const struct mib_array_node icmp = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    26,
    icmp_ids,
    icmp_nodes
};

/** index root node for ipNetToMediaTable */
struct mib_list_rootnode ipntomtree_root = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_LR,
    0,
    NULL,
    NULL,
    0
};
const s32_t ipntomentry_ids[4] = { 1, 2, 3, 4 };
struct mib_node* const ipntomentry_nodes[4] = {
    (struct mib_node*const)&ipntomtree_root, (struct mib_node*const)&ipntomtree_root,
    (struct mib_node*const)&ipntomtree_root, (struct mib_node*const)&ipntomtree_root
};
const struct mib_array_node ipntomentry = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    4,
    ipntomentry_ids,
    ipntomentry_nodes
};

s32_t ipntomtable_id = 1;
struct mib_node* ipntomtable_node = (struct mib_node*const)&ipntomentry;
struct mib_ram_array_node ipntomtable = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_RA,
    0,
    &ipntomtable_id,
    &ipntomtable_node
};

/** index root node for ipRouteTable */
struct mib_list_rootnode iprtetree_root = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_LR,
    0,
    NULL,
    NULL,
    0
};
const s32_t iprteentry_ids[13] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 };
struct mib_node* const iprteentry_nodes[13] = {
    (struct mib_node*const)&iprtetree_root, (struct mib_node*const)&iprtetree_root,
    (struct mib_node*const)&iprtetree_root, (struct mib_node*const)&iprtetree_root,
    (struct mib_node*const)&iprtetree_root, (struct mib_node*const)&iprtetree_root,
    (struct mib_node*const)&iprtetree_root, (struct mib_node*const)&iprtetree_root,
    (struct mib_node*const)&iprtetree_root, (struct mib_node*const)&iprtetree_root,
    (struct mib_node*const)&iprtetree_root, (struct mib_node*const)&iprtetree_root,
    (struct mib_node*const)&iprtetree_root
};
const struct mib_array_node iprteentry = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    13,
    iprteentry_ids,
    iprteentry_nodes
};

s32_t iprtetable_id = 1;
struct mib_node* iprtetable_node = (struct mib_node*const)&iprteentry;
struct mib_ram_array_node iprtetable = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_RA,
    0,
    &iprtetable_id,
    &iprtetable_node
};

/** index root node for ipAddrTable */
struct mib_list_rootnode ipaddrtree_root = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_LR,
    0,
    NULL,
    NULL,
    0
};
const s32_t ipaddrentry_ids[5] = { 1, 2, 3, 4, 5 };
struct mib_node* const ipaddrentry_nodes[5] = {
    (struct mib_node*const)&ipaddrtree_root,
    (struct mib_node*const)&ipaddrtree_root,
    (struct mib_node*const)&ipaddrtree_root,
    (struct mib_node*const)&ipaddrtree_root,
    (struct mib_node*const)&ipaddrtree_root
};
const struct mib_array_node ipaddrentry = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    5,
    ipaddrentry_ids,
    ipaddrentry_nodes
};

s32_t ipaddrtable_id = 1;
struct mib_node* ipaddrtable_node = (struct mib_node*const)&ipaddrentry;
struct mib_ram_array_node ipaddrtable = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_RA,
    0,
    &ipaddrtable_id,
    &ipaddrtable_node
};

/* ip .1.3.6.1.2.1.4 */
const mib_scalar_node ip_scalar = {
    &ip_get_object_def,
    &ip_get_value,
    &ip_set_test,
    &noleafs_set_value,
    MIB_NODE_SC,
    0
};
const s32_t ip_ids[23] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 };
struct mib_node* const ip_nodes[23] = {
    (struct mib_node*const)&ip_scalar,  (struct mib_node*const)&ip_scalar,
    (struct mib_node*const)&ip_scalar,  (struct mib_node*const)&ip_scalar,
    (struct mib_node*const)&ip_scalar,  (struct mib_node*const)&ip_scalar,
    (struct mib_node*const)&ip_scalar,  (struct mib_node*const)&ip_scalar,
    (struct mib_node*const)&ip_scalar,  (struct mib_node*const)&ip_scalar,
    (struct mib_node*const)&ip_scalar,  (struct mib_node*const)&ip_scalar,
    (struct mib_node*const)&ip_scalar,  (struct mib_node*const)&ip_scalar,
    (struct mib_node*const)&ip_scalar,  (struct mib_node*const)&ip_scalar,
    (struct mib_node*const)&ip_scalar,  (struct mib_node*const)&ip_scalar,
    (struct mib_node*const)&ip_scalar,  (struct mib_node*const)&ipaddrtable,
    (struct mib_node*const)&iprtetable, (struct mib_node*const)&ipntomtable,
    (struct mib_node*const)&ip_scalar
};
const struct mib_array_node mib2_ip = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    23,
    ip_ids,
    ip_nodes
};

/** index root node for atTable */
struct mib_list_rootnode arptree_root = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_LR,
    0,
    NULL,
    NULL,
    0
};
const s32_t atentry_ids[3] = { 1, 2, 3 };
struct mib_node* const atentry_nodes[3] = {
    (struct mib_node*const)&arptree_root,
    (struct mib_node*const)&arptree_root,
    (struct mib_node*const)&arptree_root
};
const struct mib_array_node atentry = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    3,
    atentry_ids,
    atentry_nodes
};

const s32_t attable_id = 1;
struct mib_node* const attable_node = (struct mib_node*const)&atentry;
const struct mib_array_node attable = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    1,
    &attable_id,
    &attable_node
};

/* at .1.3.6.1.2.1.3 */
s32_t at_id = 1;
struct mib_node* mib2_at_node = (struct mib_node*const)&attable;
struct mib_ram_array_node at = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_RA,
    0,
    &at_id,
    &mib2_at_node
};

/** index root node for ifTable */
struct mib_list_rootnode iflist_root = {
    &ifentry_get_object_def,
    &ifentry_get_value,
#if SNMP_SAFE_REQUESTS
    &noleafs_set_test,
    &noleafs_set_value,
#else /* SNMP_SAFE_REQUESTS */
    &ifentry_set_test,
    &ifentry_set_value,
#endif /* SNMP_SAFE_REQUESTS */
    MIB_NODE_LR,
    0,
    NULL,
    NULL,
    0
};
const s32_t ifentry_ids[22] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 };
struct mib_node* const ifentry_nodes[22] = {
    (struct mib_node*const)&iflist_root, (struct mib_node*const)&iflist_root,
    (struct mib_node*const)&iflist_root, (struct mib_node*const)&iflist_root,
    (struct mib_node*const)&iflist_root, (struct mib_node*const)&iflist_root,
    (struct mib_node*const)&iflist_root, (struct mib_node*const)&iflist_root,
    (struct mib_node*const)&iflist_root, (struct mib_node*const)&iflist_root,
    (struct mib_node*const)&iflist_root, (struct mib_node*const)&iflist_root,
    (struct mib_node*const)&iflist_root, (struct mib_node*const)&iflist_root,
    (struct mib_node*const)&iflist_root, (struct mib_node*const)&iflist_root,
    (struct mib_node*const)&iflist_root, (struct mib_node*const)&iflist_root,
    (struct mib_node*const)&iflist_root, (struct mib_node*const)&iflist_root,
    (struct mib_node*const)&iflist_root, (struct mib_node*const)&iflist_root
};
const struct mib_array_node ifentry = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    22,
    ifentry_ids,
    ifentry_nodes
};

s32_t iftable_id = 1;
struct mib_node* iftable_node = (struct mib_node*const)&ifentry;
struct mib_ram_array_node iftable = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_RA,
    0,
    &iftable_id,
    &iftable_node
};

/* interfaces .1.3.6.1.2.1.2 */
const mib_scalar_node interfaces_scalar = {
    &interfaces_get_object_def,
    &interfaces_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_SC,
    0
};
const s32_t interfaces_ids[2] = { 1, 2 };
struct mib_node* const interfaces_nodes[2] = {
    (struct mib_node*const)&interfaces_scalar, (struct mib_node*const)&iftable
};
const struct mib_array_node interfaces = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    2,
    interfaces_ids,
    interfaces_nodes
};


/*             0 1 2 3 4 5 6 */
/* system .1.3.6.1.2.1.1 */
const mib_scalar_node sys_tem_scalar = {
    &system_get_object_def,
    &system_get_value,
    &system_set_test,
    &system_set_value,
    MIB_NODE_SC,
    0
};
const s32_t sys_tem_ids[7] = { 1, 2, 3, 4, 5, 6, 7 };
struct mib_node* const sys_tem_nodes[7] = {
    (struct mib_node*const)&sys_tem_scalar, (struct mib_node*const)&sys_tem_scalar,
    (struct mib_node*const)&sys_tem_scalar, (struct mib_node*const)&sys_tem_scalar,
    (struct mib_node*const)&sys_tem_scalar, (struct mib_node*const)&sys_tem_scalar,
    (struct mib_node*const)&sys_tem_scalar
};
/* work around name issue with 'sys_tem', some compiler(s?) seem to reserve 'system' */
const struct mib_array_node sys_tem = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    7,
    sys_tem_ids,
    sys_tem_nodes
};

/* mib-2 .1.3.6.1.2.1 */
#if LWIP_TCP
#define MIB2_GROUPS 8
#else
#define MIB2_GROUPS 7
#endif
const s32_t mib2_ids[MIB2_GROUPS] =
{
    1,
    2,
    3,
    4,
    5,
#if LWIP_TCP
    6,
#endif
    7,
    11
};
struct mib_node* const mib2_nodes[MIB2_GROUPS] = {
    (struct mib_node*const)&sys_tem,
    (struct mib_node*const)&interfaces,
    (struct mib_node*const)&at,
    (struct mib_node*const)&mib2_ip,
    (struct mib_node*const)&icmp,
#if LWIP_TCP
    (struct mib_node*const)&tcp,
#endif
    (struct mib_node*const)&udp,
    (struct mib_node*const)&snmp
};

const struct mib_array_node mib2 = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    MIB2_GROUPS,
    mib2_ids,
    mib2_nodes
};

/* mgmt .1.3.6.1.2 */
const s32_t mgmt_ids[1] = { 1 };
struct mib_node* const mgmt_nodes[1] = { (struct mib_node*const)&mib2 };
const struct mib_array_node mgmt = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    1,
    mgmt_ids,
    mgmt_nodes
};

/* internet .1.3.6.1 */
#if SNMP_PRIVATE_MIB
s32_t internet_ids[2] = { 2, 4 };
struct mib_node* const internet_nodes[2] = { (struct mib_node*const)&mgmt, (struct mib_node*const)&private };
const struct mib_array_node internet = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    2,
    internet_ids,
    internet_nodes
};
#else
const s32_t internet_ids[1] = { 2 };
struct mib_node* const internet_nodes[1] = { (struct mib_node*const)&mgmt };
const struct mib_array_node internet = {
    &noleafs_get_object_def,
    &noleafs_get_value,
    &noleafs_set_test,
    &noleafs_set_value,
    MIB_NODE_AR,
    1,
    internet_ids,
    internet_nodes
};
#endif

/** mib-2.system.sysObjectID  */
static struct snmp_obj_id sysobjid = { SNMP_SYSOBJID_LEN, SNMP_SYSOBJID };
/** enterprise ID for generic TRAPs, .iso.org.dod.internet.mgmt.mib-2.snmp */
static struct snmp_obj_id snmpgrp_id = { 7, { 1, 3, 6, 1, 2, 1, 11 } };
/** mib-2.system.sysServices */
static const s32_t sysservices = SNMP_SYSSERVICES;

/** mib-2.system.sysDescr */
static const u8_t sysdescr_len_default = 4;
static const u8_t sysdescr_default[] = "lwIP";
static u8_t* sysdescr_len_ptr = (u8_t*)&sysdescr_len_default;
static u8_t* sysdescr_ptr = (u8_t*)&sysdescr_default[0];
/** mib-2.system.sysContact */
static const u8_t syscontact_len_default = 0;
static const u8_t syscontact_default[] = "";
static u8_t* syscontact_len_ptr = (u8_t*)&syscontact_len_default;
static u8_t* syscontact_ptr = (u8_t*)&syscontact_default[0];
/** mib-2.system.sysName */
static const u8_t sysname_len_default = 8;
static const u8_t sysname_default[] = "FQDN-unk";
static u8_t* sysname_len_ptr = (u8_t*)&sysname_len_default;
static u8_t* sysname_ptr = (u8_t*)&sysname_default[0];
/** mib-2.system.sysLocation */
static const u8_t syslocation_len_default = 0;
static const u8_t syslocation_default[] = "";
static u8_t* syslocation_len_ptr = (u8_t*)&syslocation_len_default;
static u8_t* syslocation_ptr = (u8_t*)&syslocation_default[0];
/** mib-2.snmp.snmpEnableAuthenTraps */
static const u8_t snmpenableauthentraps_default = 2; /* disabled */
static u8_t* snmpenableauthentraps_ptr = (u8_t*)&snmpenableauthentraps_default;

/** mib-2.interfaces.ifTable.ifEntry.ifSpecific (zeroDotZero) */
static const struct snmp_obj_id ifspecific = { 2, { 0, 0 } };
/** mib-2.ip.ipRouteTable.ipRouteEntry.ipRouteInfo (zeroDotZero) */
static const struct snmp_obj_id iprouteinfo = { 2, { 0, 0 } };



/* mib-2.system counter(s) */
static u32_t sysuptime = 0;

/* mib-2.ip counter(s) */
static u32_t ipinreceives = 0,
             ipinhdrerrors = 0,
             ipinaddrerrors = 0,
             ipforwdatagrams = 0,
             ipinunknownprotos = 0,
             ipindiscards = 0,
             ipindelivers = 0,
             ipoutrequests = 0,
             ipoutdiscards = 0,
             ipoutnoroutes = 0,
             ipreasmreqds = 0,
             ipreasmoks = 0,
             ipreasmfails = 0,
             ipfragoks = 0,
             ipfragfails = 0,
             ipfragcreates = 0,
             iproutingdiscards = 0;
/* mib-2.icmp counter(s) */
static u32_t icmpinmsgs = 0,
             icmpinerrors = 0,
             icmpindestunreachs = 0,
             icmpintimeexcds = 0,
             icmpinparmprobs = 0,
             icmpinsrcquenchs = 0,
             icmpinredirects = 0,
             icmpinechos = 0,
             icmpinechoreps = 0,
             icmpintimestamps = 0,
             icmpintimestampreps = 0,
             icmpinaddrmasks = 0,
             icmpinaddrmaskreps = 0,
             icmpoutmsgs = 0,
             icmpouterrors = 0,
             icmpoutdestunreachs = 0,
             icmpouttimeexcds = 0,
             icmpoutparmprobs = 0,
             icmpoutsrcquenchs = 0,
             icmpoutredirects = 0,
             icmpoutechos = 0,
             icmpoutechoreps = 0,
             icmpouttimestamps = 0,
             icmpouttimestampreps = 0,
             icmpoutaddrmasks = 0,
             icmpoutaddrmaskreps = 0;
/* mib-2.tcp counter(s) */
static u32_t tcpactiveopens = 0,
             tcppassiveopens = 0,
             tcpattemptfails = 0,
             tcpestabresets = 0,
             tcpinsegs = 0,
             tcpoutsegs = 0,
             tcpretranssegs = 0,
             tcpinerrs = 0,
             tcpoutrsts = 0;
/* mib-2.udp counter(s) */
static u32_t udpindatagrams = 0,
             udpnoports = 0,
             udpinerrors = 0,
             udpoutdatagrams = 0;
/* mib-2.snmp counter(s) */
static u32_t snmpinpkts = 0,
             snmpoutpkts = 0,
             snmpinbadversions = 0,
             snmpinbadcommunitynames = 0,
             snmpinbadcommunityuses = 0,
             snmpinasnparseerrs = 0,
             snmpintoobigs = 0,
             snmpinnosuchnames = 0,
             snmpinbadvalues = 0,
             snmpinreadonlys = 0,
             snmpingenerrs = 0,
             snmpintotalreqvars = 0,
             snmpintotalsetvars = 0,
             snmpingetrequests = 0,
             snmpingetnexts = 0,
             snmpinsetrequests = 0,
             snmpingetresponses = 0,
             snmpintraps = 0,
             snmpouttoobigs = 0,
             snmpoutnosuchnames = 0,
             snmpoutbadvalues = 0,
             snmpoutgenerrs = 0,
             snmpoutgetrequests = 0,
             snmpoutgetnexts = 0,
             snmpoutsetrequests = 0,
             snmpoutgetresponses = 0,
             snmpouttraps = 0;



/* prototypes of the following functions are in lwip/src/include/lwip/snmp.h */
/**
 * Copy octet string.
 *
 * @param dst points to destination
 * @param src points to source
 * @param n number of octets to copy.
 */
void ocstrncpy(u8_t *dst, u8_t *src, u8_t n)
{
    while (n > 0)
    {
        n--;
        *dst++ = *src++;
    }
}

/**
 * Copy object identifier (s32_t) array.
 *
 * @param dst points to destination
 * @param src points to source
 * @param n number of sub identifiers to copy.
 */
void objectidncpy(s32_t *dst, s32_t *src, u8_t n)
{
    while (n > 0)
    {
        n--;
        *dst++ = *src++;
    }
}

/**
 * Initializes sysDescr pointers.
 *
 * @param str if non-NULL then copy str pointer
 * @param len points to string length, excluding zero terminator
 */
void snmp_set_sysdesr(u8_t *str, u8_t *len)
{
    if (str != NULL)
    {
        sysdescr_ptr = str;
        sysdescr_len_ptr = len;
    }
}

void snmp_get_sysobjid_ptr(struct snmp_obj_id **oid)
{
    *oid = &sysobjid;
}

/**
 * Initializes sysObjectID value.
 *
 * @param oid points to stuct snmp_obj_id to copy
 */
void snmp_set_sysobjid(struct snmp_obj_id *oid)
{
    sysobjid = *oid;
}

/**
 * Must be called at regular 10 msec interval from a timer interrupt
 * or signal handler depending on your runtime environment.
 */
void snmp_inc_sysuptime(void)
{
    sysuptime++;
}

void snmp_add_sysuptime(u32_t value)
{
    sysuptime += value;
}

void snmp_get_sysuptime(u32_t *value)
{
    SNMP_GET_SYSUPTIME(sysuptime);
    *value = sysuptime;
}

/**
 * Initializes sysContact pointers,
 * e.g. ptrs to non-volatile memory external to lwIP.
 *
 * @param ocstr if non-NULL then copy str pointer
 * @param ocstrlen points to string length, excluding zero terminator
 */
void snmp_set_syscontact(u8_t *ocstr, u8_t *ocstrlen)
{
    if (ocstr != NULL)
    {
        syscontact_ptr = ocstr;
        syscontact_len_ptr = ocstrlen;
    }
}

/**
 * Initializes sysName pointers,
 * e.g. ptrs to non-volatile memory external to lwIP.
 *
 * @param ocstr if non-NULL then copy str pointer
 * @param ocstrlen points to string length, excluding zero terminator
 */
void snmp_set_sysname(u8_t *ocstr, u8_t *ocstrlen)
{
    if (ocstr != NULL)
    {
        sysname_ptr = ocstr;
        sysname_len_ptr = ocstrlen;
    }
}

/**
 * Initializes sysLocation pointers,
 * e.g. ptrs to non-volatile memory external to lwIP.
 *
 * @param ocstr if non-NULL then copy str pointer
 * @param ocstrlen points to string length, excluding zero terminator
 */
void snmp_set_syslocation(u8_t *ocstr, u8_t *ocstrlen)
{
    if (ocstr != NULL)
    {
        syslocation_ptr = ocstr;
        syslocation_len_ptr = ocstrlen;
    }
}


void snmp_add_ifinoctets(struct netif *ni, u32_t value)
{
    ni->ifinoctets += value;
}

void snmp_inc_ifinucastpkts(struct netif *ni)
{
    (ni->ifinucastpkts)++;
}

void snmp_inc_ifinnucastpkts(struct netif *ni)
{
    (ni->ifinnucastpkts)++;
}

void snmp_inc_ifindiscards(struct netif *ni)
{
    (ni->ifindiscards)++;
}

void snmp_add_ifoutoctets(struct netif *ni, u32_t value)
{
    ni->ifoutoctets += value;
}

void snmp_inc_ifoutucastpkts(struct netif *ni)
{
    (ni->ifoutucastpkts)++;
}

void snmp_inc_ifoutnucastpkts(struct netif *ni)
{
    (ni->ifoutnucastpkts)++;
}

void snmp_inc_ifoutdiscards(struct netif *ni)
{
    (ni->ifoutdiscards)++;
}

void snmp_inc_iflist(void)
{
    struct mib_list_node *if_node = NULL;

    snmp_mib_node_insert(&iflist_root, iflist_root.count + 1, &if_node);
    /* enable getnext traversal on filled table */
    iftable.maxlength = 1;
}

void snmp_dec_iflist(void)
{
    snmp_mib_node_delete(&iflist_root, iflist_root.tail);
    /* disable getnext traversal on empty table */
    if (iflist_root.count == 0)
    {
        iftable.maxlength = 0;
    }
}

/**
 * Inserts ARP table indexes (.xIfIndex.xNetAddress)
 * into arp table index trees (both atTable and ipNetToMediaTable).
 */
void snmp_insert_arpidx_tree(struct netif *ni, struct ip_addr *ip)
{
    struct mib_list_rootnode *at_rn;
    struct mib_list_node *at_node;
    struct ip_addr hip;
    s32_t arpidx[5];
    u8_t level, tree;

    LWIP_ASSERT("ni != NULL", ni != NULL);
    snmp_netiftoifindex(ni, &arpidx[0]);
    hip.addr = ntohl(ip->addr);
    snmp_iptooid(&hip, &arpidx[1]);

    for (tree = 0; tree < 2; tree++)
    {
        if (tree == 0)
        {
            at_rn = &arptree_root;
        }
        else
        {
            at_rn = &ipntomtree_root;
        }
        for (level = 0; level < 5; level++)
        {
            at_node = NULL;
            snmp_mib_node_insert(at_rn, arpidx[level], &at_node);
            if ((level != 4) && (at_node != NULL))
            {
                if (at_node->nptr == NULL)
                {
                    at_rn = snmp_mib_lrn_alloc();
                    at_node->nptr = (struct mib_node*)at_rn;
                    if (at_rn != NULL)
                    {
                        if (level == 3)
                        {
                            if (tree == 0)
                            {
                                at_rn->get_object_def = atentry_get_object_def;
                                at_rn->get_value = atentry_get_value;
                            }
                            else
                            {
                                at_rn->get_object_def = ip_ntomentry_get_object_def;
                                at_rn->get_value = ip_ntomentry_get_value;
                            }
                            at_rn->set_test = noleafs_set_test;
                            at_rn->set_value = noleafs_set_value;
                        }
                    }
                    else
                    {
                        /* at_rn == NULL, malloc failure */
                        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_insert_arpidx_tree() insert failed, mem full"));
                        break;
                    }
                }
                else
                {
                    at_rn = (struct mib_list_rootnode*)at_node->nptr;
                }
            }
        }
    }
    /* enable getnext traversal on filled tables */
    at.maxlength = 1;
    ipntomtable.maxlength = 1;
}

/**
 * Removes ARP table indexes (.xIfIndex.xNetAddress)
 * from arp table index trees.
 */
void snmp_delete_arpidx_tree(struct netif *ni, struct ip_addr *ip)
{
    struct mib_list_rootnode *at_rn, *next, *del_rn[5];
    struct mib_list_node *at_n, *del_n[5];
    struct ip_addr hip;
    s32_t arpidx[5];
    u8_t fc, tree, level, del_cnt;

    snmp_netiftoifindex(ni, &arpidx[0]);
    hip.addr = ntohl(ip->addr);
    snmp_iptooid(&hip, &arpidx[1]);

    for (tree = 0; tree < 2; tree++)
    {
        /* mark nodes for deletion */
        if (tree == 0)
        {
            at_rn = &arptree_root;
        }
        else
        {
            at_rn = &ipntomtree_root;
        }
        level = 0;
        del_cnt = 0;
        while ((level < 5) && (at_rn != NULL))
        {
            fc = snmp_mib_node_find(at_rn, arpidx[level], &at_n);
            if (fc == 0)
            {
                /* arpidx[level] does not exist */
                del_cnt = 0;
                at_rn = NULL;
            }
            else if (fc == 1)
            {
                del_rn[del_cnt] = at_rn;
                del_n[del_cnt] = at_n;
                del_cnt++;
                at_rn = (struct mib_list_rootnode*)(at_n->nptr);
            }
            else if (fc == 2)
            {
                /* reset delete (2 or more childs) */
                del_cnt = 0;
                at_rn = (struct mib_list_rootnode*)(at_n->nptr);
            }
            level++;
        }
        /* delete marked index nodes */
        while (del_cnt > 0)
        {
            del_cnt--;

            at_rn = del_rn[del_cnt];
            at_n = del_n[del_cnt];

            next = snmp_mib_node_delete(at_rn, at_n);
            if (next != NULL)
            {
                LWIP_ASSERT("next_count == 0", next->count == 0);
                snmp_mib_lrn_free(next);
            }
        }
    }
    /* disable getnext traversal on empty tables */
    if (arptree_root.count == 0)
    {
        at.maxlength = 0;
    }
    if (ipntomtree_root.count == 0)
    {
        ipntomtable.maxlength = 0;
    }
}

void snmp_inc_ipinreceives(void)
{
    ipinreceives++;
}

void snmp_inc_ipinhdrerrors(void)
{
    ipinhdrerrors++;
}

void snmp_inc_ipinaddrerrors(void)
{
    ipinaddrerrors++;
}

void snmp_inc_ipforwdatagrams(void)
{
    ipforwdatagrams++;
}

void snmp_inc_ipinunknownprotos(void)
{
    ipinunknownprotos++;
}

void snmp_inc_ipindiscards(void)
{
    ipindiscards++;
}

void snmp_inc_ipindelivers(void)
{
    ipindelivers++;
}

void snmp_inc_ipoutrequests(void)
{
    ipoutrequests++;
}

void snmp_inc_ipoutdiscards(void)
{
    ipoutdiscards++;
}

void snmp_inc_ipoutnoroutes(void)
{
    ipoutnoroutes++;
}

void snmp_inc_ipreasmreqds(void)
{
    ipreasmreqds++;
}

void snmp_inc_ipreasmoks(void)
{
    ipreasmoks++;
}

void snmp_inc_ipreasmfails(void)
{
    ipreasmfails++;
}

void snmp_inc_ipfragoks(void)
{
    ipfragoks++;
}

void snmp_inc_ipfragfails(void)
{
    ipfragfails++;
}

void snmp_inc_ipfragcreates(void)
{
    ipfragcreates++;
}

void snmp_inc_iproutingdiscards(void)
{
    iproutingdiscards++;
}

/**
 * Inserts ipAddrTable indexes (.ipAdEntAddr)
 * into index tree.
 */
void snmp_insert_ipaddridx_tree(struct netif *ni)
{
    struct mib_list_rootnode *ipa_rn;
    struct mib_list_node *ipa_node;
    struct ip_addr ip;
    s32_t ipaddridx[4];
    u8_t level;

    LWIP_ASSERT("ni != NULL", ni != NULL);
    ip.addr = ntohl(ni->ip_addr.addr);
    snmp_iptooid(&ip, &ipaddridx[0]);

    level = 0;
    ipa_rn = &ipaddrtree_root;
    while (level < 4)
    {
        ipa_node = NULL;
        snmp_mib_node_insert(ipa_rn, ipaddridx[level], &ipa_node);
        if ((level != 3) && (ipa_node != NULL))
        {
            if (ipa_node->nptr == NULL)
            {
                ipa_rn = snmp_mib_lrn_alloc();
                ipa_node->nptr = (struct mib_node*)ipa_rn;
                if (ipa_rn != NULL)
                {
                    if (level == 2)
                    {
                        ipa_rn->get_object_def = ip_addrentry_get_object_def;
                        ipa_rn->get_value = ip_addrentry_get_value;
                        ipa_rn->set_test = noleafs_set_test;
                        ipa_rn->set_value = noleafs_set_value;
                    }
                }
                else
                {
                    /* ipa_rn == NULL, malloc failure */
                    LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_insert_ipaddridx_tree() insert failed, mem full"));
                    break;
                }
            }
            else
            {
                ipa_rn = (struct mib_list_rootnode*)ipa_node->nptr;
            }
        }
        level++;
    }
    /* enable getnext traversal on filled table */
    ipaddrtable.maxlength = 1;
}

/**
 * Removes ipAddrTable indexes (.ipAdEntAddr)
 * from index tree.
 */
void snmp_delete_ipaddridx_tree(struct netif *ni)
{
    struct mib_list_rootnode *ipa_rn, *next, *del_rn[4];
    struct mib_list_node *ipa_n, *del_n[4];
    struct ip_addr ip;
    s32_t ipaddridx[4];
    u8_t fc, level, del_cnt;

    LWIP_ASSERT("ni != NULL", ni != NULL);
    ip.addr = ntohl(ni->ip_addr.addr);
    snmp_iptooid(&ip, &ipaddridx[0]);

    /* mark nodes for deletion */
    level = 0;
    del_cnt = 0;
    ipa_rn = &ipaddrtree_root;
    while ((level < 4) && (ipa_rn != NULL))
    {
        fc = snmp_mib_node_find(ipa_rn, ipaddridx[level], &ipa_n);
        if (fc == 0)
        {
            /* ipaddridx[level] does not exist */
            del_cnt = 0;
            ipa_rn = NULL;
        }
        else if (fc == 1)
        {
            del_rn[del_cnt] = ipa_rn;
            del_n[del_cnt] = ipa_n;
            del_cnt++;
            ipa_rn = (struct mib_list_rootnode*)(ipa_n->nptr);
        }
        else if (fc == 2)
        {
            /* reset delete (2 or more childs) */
            del_cnt = 0;
            ipa_rn = (struct mib_list_rootnode*)(ipa_n->nptr);
        }
        level++;
    }
    /* delete marked index nodes */
    while (del_cnt > 0)
    {
        del_cnt--;

        ipa_rn = del_rn[del_cnt];
        ipa_n = del_n[del_cnt];

        next = snmp_mib_node_delete(ipa_rn, ipa_n);
        if (next != NULL)
        {
            LWIP_ASSERT("next_count == 0", next->count == 0);
            snmp_mib_lrn_free(next);
        }
    }
    /* disable getnext traversal on empty table */
    if (ipaddrtree_root.count == 0)
    {
        ipaddrtable.maxlength = 0;
    }
}

/**
 * Inserts ipRouteTable indexes (.ipRouteDest)
 * into index tree.
 *
 * @param dflt non-zero for the default rte, zero for network rte
 * @param ni points to network interface for this rte
 *
 * @todo record sysuptime for _this_ route when it is installed
 *   (needed for ipRouteAge) in the netif.
 */
void snmp_insert_iprteidx_tree(u8_t dflt, struct netif *ni)
{
    u8_t insert = 0;
    struct ip_addr dst;

    if (dflt != 0)
    {
        /* the default route 0.0.0.0 */
        dst.addr = 0;
        insert = 1;
    }
    else
    {
        /* route to the network address */
        dst.addr = ntohl(ni->ip_addr.addr & ni->netmask.addr);
        /* exclude 0.0.0.0 network (reserved for default rte) */
        if (dst.addr != 0)
        {
            insert = 1;
        }
    }
    if (insert)
    {
        struct mib_list_rootnode *iprte_rn;
        struct mib_list_node *iprte_node;
        s32_t iprteidx[4];
        u8_t level;

        snmp_iptooid(&dst, &iprteidx[0]);
        level = 0;
        iprte_rn = &iprtetree_root;
        while (level < 4)
        {
            iprte_node = NULL;
            snmp_mib_node_insert(iprte_rn, iprteidx[level], &iprte_node);
            if ((level != 3) && (iprte_node != NULL))
            {
                if (iprte_node->nptr == NULL)
                {
                    iprte_rn = snmp_mib_lrn_alloc();
                    iprte_node->nptr = (struct mib_node*)iprte_rn;
                    if (iprte_rn != NULL)
                    {
                        if (level == 2)
                        {
                            iprte_rn->get_object_def = ip_rteentry_get_object_def;
                            iprte_rn->get_value = ip_rteentry_get_value;
                            iprte_rn->set_test = noleafs_set_test;
                            iprte_rn->set_value = noleafs_set_value;
                        }
                    }
                    else
                    {
                        /* iprte_rn == NULL, malloc failure */
                        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_insert_iprteidx_tree() insert failed, mem full"));
                        break;
                    }
                }
                else
                {
                    iprte_rn = (struct mib_list_rootnode*)iprte_node->nptr;
                }
            }
            level++;
        }
    }
    /* enable getnext traversal on filled table */
    iprtetable.maxlength = 1;
}

/**
 * Removes ipRouteTable indexes (.ipRouteDest)
 * from index tree.
 *
 * @param dflt non-zero for the default rte, zero for network rte
 * @param ni points to network interface for this rte or NULL
 *   for default route to be removed.
 */
void snmp_delete_iprteidx_tree(u8_t dflt, struct netif *ni)
{
    u8_t delete = 0;
    struct ip_addr dst;

    if (dflt != 0)
    {
        /* the default route 0.0.0.0 */
        dst.addr = 0;
        delete = 1;
    }
    else
    {
        /* route to the network address */
        dst.addr = ntohl(ni->ip_addr.addr & ni->netmask.addr);
        /* exclude 0.0.0.0 network (reserved for default rte) */
        if (dst.addr != 0)
        {
            delete = 1;
        }
    }
    if (delete)
    {
        struct mib_list_rootnode *iprte_rn, *next, *del_rn[4];
        struct mib_list_node *iprte_n, *del_n[4];
        s32_t iprteidx[4];
        u8_t fc, level, del_cnt;

        snmp_iptooid(&dst, &iprteidx[0]);
        /* mark nodes for deletion */
        level = 0;
        del_cnt = 0;
        iprte_rn = &iprtetree_root;
        while ((level < 4) && (iprte_rn != NULL))
        {
            fc = snmp_mib_node_find(iprte_rn, iprteidx[level], &iprte_n);
            if (fc == 0)
            {
                /* iprteidx[level] does not exist */
                del_cnt = 0;
                iprte_rn = NULL;
            }
            else if (fc == 1)
            {
                del_rn[del_cnt] = iprte_rn;
                del_n[del_cnt] = iprte_n;
                del_cnt++;
                iprte_rn = (struct mib_list_rootnode*)(iprte_n->nptr);
            }
            else if (fc == 2)
            {
                /* reset delete (2 or more childs) */
                del_cnt = 0;
                iprte_rn = (struct mib_list_rootnode*)(iprte_n->nptr);
            }
            level++;
        }
        /* delete marked index nodes */
        while (del_cnt > 0)
        {
            del_cnt--;

            iprte_rn = del_rn[del_cnt];
            iprte_n = del_n[del_cnt];

            next = snmp_mib_node_delete(iprte_rn, iprte_n);
            if (next != NULL)
            {
                LWIP_ASSERT("next_count == 0", next->count == 0);
                snmp_mib_lrn_free(next);
            }
        }
    }
    /* disable getnext traversal on empty table */
    if (iprtetree_root.count == 0)
    {
        iprtetable.maxlength = 0;
    }
}


void snmp_inc_icmpinmsgs(void)
{
    icmpinmsgs++;
}

void snmp_inc_icmpinerrors(void)
{
    icmpinerrors++;
}

void snmp_inc_icmpindestunreachs(void)
{
    icmpindestunreachs++;
}

void snmp_inc_icmpintimeexcds(void)
{
    icmpintimeexcds++;
}

void snmp_inc_icmpinparmprobs(void)
{
    icmpinparmprobs++;
}

void snmp_inc_icmpinsrcquenchs(void)
{
    icmpinsrcquenchs++;
}

void snmp_inc_icmpinredirects(void)
{
    icmpinredirects++;
}

void snmp_inc_icmpinechos(void)
{
    icmpinechos++;
}

void snmp_inc_icmpinechoreps(void)
{
    icmpinechoreps++;
}

void snmp_inc_icmpintimestamps(void)
{
    icmpintimestamps++;
}

void snmp_inc_icmpintimestampreps(void)
{
    icmpintimestampreps++;
}

void snmp_inc_icmpinaddrmasks(void)
{
    icmpinaddrmasks++;
}

void snmp_inc_icmpinaddrmaskreps(void)
{
    icmpinaddrmaskreps++;
}

void snmp_inc_icmpoutmsgs(void)
{
    icmpoutmsgs++;
}

void snmp_inc_icmpouterrors(void)
{
    icmpouterrors++;
}

void snmp_inc_icmpoutdestunreachs(void)
{
    icmpoutdestunreachs++;
}

void snmp_inc_icmpouttimeexcds(void)
{
    icmpouttimeexcds++;
}

void snmp_inc_icmpoutparmprobs(void)
{
    icmpoutparmprobs++;
}

void snmp_inc_icmpoutsrcquenchs(void)
{
    icmpoutsrcquenchs++;
}

void snmp_inc_icmpoutredirects(void)
{
    icmpoutredirects++;
}

void snmp_inc_icmpoutechos(void)
{
    icmpoutechos++;
}

void snmp_inc_icmpoutechoreps(void)
{
    icmpoutechoreps++;
}

void snmp_inc_icmpouttimestamps(void)
{
    icmpouttimestamps++;
}

void snmp_inc_icmpouttimestampreps(void)
{
    icmpouttimestampreps++;
}

void snmp_inc_icmpoutaddrmasks(void)
{
    icmpoutaddrmasks++;
}

void snmp_inc_icmpoutaddrmaskreps(void)
{
    icmpoutaddrmaskreps++;
}

void snmp_inc_tcpactiveopens(void)
{
    tcpactiveopens++;
}

void snmp_inc_tcppassiveopens(void)
{
    tcppassiveopens++;
}

void snmp_inc_tcpattemptfails(void)
{
    tcpattemptfails++;
}

void snmp_inc_tcpestabresets(void)
{
    tcpestabresets++;
}

void snmp_inc_tcpinsegs(void)
{
    tcpinsegs++;
}

void snmp_inc_tcpoutsegs(void)
{
    tcpoutsegs++;
}

void snmp_inc_tcpretranssegs(void)
{
    tcpretranssegs++;
}

void snmp_inc_tcpinerrs(void)
{
    tcpinerrs++;
}

void snmp_inc_tcpoutrsts(void)
{
    tcpoutrsts++;
}

void snmp_inc_udpindatagrams(void)
{
    udpindatagrams++;
}

void snmp_inc_udpnoports(void)
{
    udpnoports++;
}

void snmp_inc_udpinerrors(void)
{
    udpinerrors++;
}

void snmp_inc_udpoutdatagrams(void)
{
    udpoutdatagrams++;
}

/**
 * Inserts udpTable indexes (.udpLocalAddress.udpLocalPort)
 * into index tree.
 */
void snmp_insert_udpidx_tree(struct udp_pcb *pcb)
{
    struct mib_list_rootnode *udp_rn;
    struct mib_list_node *udp_node;
    struct ip_addr ip;
    s32_t udpidx[5];
    u8_t level;

    LWIP_ASSERT("pcb != NULL", pcb != NULL);
    ip.addr = ntohl(pcb->local_ip.addr);
    snmp_iptooid(&ip, &udpidx[0]);
    udpidx[4] = pcb->local_port;

    udp_rn = &udp_root;
    for (level = 0; level < 5; level++)
    {
        udp_node = NULL;
        snmp_mib_node_insert(udp_rn, udpidx[level], &udp_node);
        if ((level != 4) && (udp_node != NULL))
        {
            if (udp_node->nptr == NULL)
            {
                udp_rn = snmp_mib_lrn_alloc();
                udp_node->nptr = (struct mib_node*)udp_rn;
                if (udp_rn != NULL)
                {
                    if (level == 3)
                    {
                        udp_rn->get_object_def = udpentry_get_object_def;
                        udp_rn->get_value = udpentry_get_value;
                        udp_rn->set_test = noleafs_set_test;
                        udp_rn->set_value = noleafs_set_value;
                    }
                }
                else
                {
                    /* udp_rn == NULL, malloc failure */
                    LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_insert_udpidx_tree() insert failed, mem full"));
                    break;
                }
            }
            else
            {
                udp_rn = (struct mib_list_rootnode*)udp_node->nptr;
            }
        }
    }
    udptable.maxlength = 1;
}

/**
 * Removes udpTable indexes (.udpLocalAddress.udpLocalPort)
 * from index tree.
 */
void snmp_delete_udpidx_tree(struct udp_pcb *pcb)
{
    struct mib_list_rootnode *udp_rn, *next, *del_rn[5];
    struct mib_list_node *udp_n, *del_n[5];
    struct ip_addr ip;
    s32_t udpidx[5];
    u8_t bindings, fc, level, del_cnt;

    LWIP_ASSERT("pcb != NULL", pcb != NULL);
    ip.addr = ntohl(pcb->local_ip.addr);
    snmp_iptooid(&ip, &udpidx[0]);
    udpidx[4] = pcb->local_port;

    /* count PCBs for a given binding
       (e.g. when reusing ports or for temp output PCBs) */
    bindings = 0;
    pcb = udp_pcbs;
    while ((pcb != NULL))
    {
        if ((pcb->local_ip.addr == ip.addr) &&
            (pcb->local_port == udpidx[4]))
        {
            bindings++;
        }
        pcb = pcb->next;
    }
    if (bindings == 1)
    {
        /* selectively remove */
        /* mark nodes for deletion */
        level = 0;
        del_cnt = 0;
        udp_rn = &udp_root;
        while ((level < 5) && (udp_rn != NULL))
        {
            fc = snmp_mib_node_find(udp_rn, udpidx[level], &udp_n);
            if (fc == 0)
            {
                /* udpidx[level] does not exist */
                del_cnt = 0;
                udp_rn = NULL;
            }
            else if (fc == 1)
            {
                del_rn[del_cnt] = udp_rn;
                del_n[del_cnt] = udp_n;
                del_cnt++;
                udp_rn = (struct mib_list_rootnode*)(udp_n->nptr);
            }
            else if (fc == 2)
            {
                /* reset delete (2 or more childs) */
                del_cnt = 0;
                udp_rn = (struct mib_list_rootnode*)(udp_n->nptr);
            }
            level++;
        }
        /* delete marked index nodes */
        while (del_cnt > 0)
        {
            del_cnt--;

            udp_rn = del_rn[del_cnt];
            udp_n = del_n[del_cnt];

            next = snmp_mib_node_delete(udp_rn, udp_n);
            if (next != NULL)
            {
                LWIP_ASSERT("next_count == 0", next->count == 0);
                snmp_mib_lrn_free(next);
            }
        }
    }
    /* disable getnext traversal on empty table */
    if (udp_root.count == 0)
    {
        udptable.maxlength = 0;
    }
}


void snmp_inc_snmpinpkts(void)
{
    snmpinpkts++;
}

void snmp_inc_snmpoutpkts(void)
{
    snmpoutpkts++;
}

void snmp_inc_snmpinbadversions(void)
{
    snmpinbadversions++;
}

void snmp_inc_snmpinbadcommunitynames(void)
{
    snmpinbadcommunitynames++;
}

void snmp_inc_snmpinbadcommunityuses(void)
{
    snmpinbadcommunityuses++;
}

void snmp_inc_snmpinasnparseerrs(void)
{
    snmpinasnparseerrs++;
}

void snmp_inc_snmpintoobigs(void)
{
    snmpintoobigs++;
}

void snmp_inc_snmpinnosuchnames(void)
{
    snmpinnosuchnames++;
}

void snmp_inc_snmpinbadvalues(void)
{
    snmpinbadvalues++;
}

void snmp_inc_snmpinreadonlys(void)
{
    snmpinreadonlys++;
}

void snmp_inc_snmpingenerrs(void)
{
    snmpingenerrs++;
}

void snmp_add_snmpintotalreqvars(u8_t value)
{
    snmpintotalreqvars += value;
}

void snmp_add_snmpintotalsetvars(u8_t value)
{
    snmpintotalsetvars += value;
}

void snmp_inc_snmpingetrequests(void)
{
    snmpingetrequests++;
}

void snmp_inc_snmpingetnexts(void)
{
    snmpingetnexts++;
}

void snmp_inc_snmpinsetrequests(void)
{
    snmpinsetrequests++;
}

void snmp_inc_snmpingetresponses(void)
{
    snmpingetresponses++;
}

void snmp_inc_snmpintraps(void)
{
    snmpintraps++;
}

void snmp_inc_snmpouttoobigs(void)
{
    snmpouttoobigs++;
}

void snmp_inc_snmpoutnosuchnames(void)
{
    snmpoutnosuchnames++;
}

void snmp_inc_snmpoutbadvalues(void)
{
    snmpoutbadvalues++;
}

void snmp_inc_snmpoutgenerrs(void)
{
    snmpoutgenerrs++;
}

void snmp_inc_snmpoutgetrequests(void)
{
    snmpoutgetrequests++;
}

void snmp_inc_snmpoutgetnexts(void)
{
    snmpoutgetnexts++;
}

void snmp_inc_snmpoutsetrequests(void)
{
    snmpoutsetrequests++;
}

void snmp_inc_snmpoutgetresponses(void)
{
    snmpoutgetresponses++;
}

void snmp_inc_snmpouttraps(void)
{
    snmpouttraps++;
}

void snmp_get_snmpgrpid_ptr(struct snmp_obj_id **oid)
{
    *oid = &snmpgrp_id;
}

void snmp_set_snmpenableauthentraps(u8_t *value)
{
    if (value != NULL)
    {
        snmpenableauthentraps_ptr = value;
    }
}

void snmp_get_snmpenableauthentraps(u8_t *value)
{
    *value = *snmpenableauthentraps_ptr;
}

void
noleafs_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    LWIP_UNUSED_ARG(ident_len);
    LWIP_UNUSED_ARG(ident);
    od->instance = MIB_OBJECT_NONE;
}

void
noleafs_get_value(struct obj_def *od, u16_t len, void *value)
{
    LWIP_UNUSED_ARG(od);
    LWIP_UNUSED_ARG(len);
    LWIP_UNUSED_ARG(value);
}

u8_t
noleafs_set_test(struct obj_def *od, u16_t len, void *value)
{
    LWIP_UNUSED_ARG(od);
    LWIP_UNUSED_ARG(len);
    LWIP_UNUSED_ARG(value);
    /* can't set */
    return 0;
}

void
noleafs_set_value(struct obj_def *od, u16_t len, void *value)
{
    LWIP_UNUSED_ARG(od);
    LWIP_UNUSED_ARG(len);
    LWIP_UNUSED_ARG(value);
}


/**
 * Returns systems object definitions.
 *
 * @param ident_len the address length (2)
 * @param ident points to objectname.0 (object id trailer)
 * @param od points to object definition.
 */
static void
system_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    u8_t id;

    /* return to object name, adding index depth (1) */
    ident_len += 1;
    ident -= 1;
    if (ident_len == 2)
    {
        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        id = ident[0];
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("get_object_def system.%"U 16_F ".0\n", (u16_t)id));
        switch (id)
        {
        case 1: /* sysDescr */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
            od->v_len = *sysdescr_len_ptr;
            break;
        case 2: /* sysObjectID */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID);
            od->v_len = sysobjid.len * sizeof(s32_t);
            break;
        case 3: /* sysUpTime */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS);
            od->v_len = sizeof(u32_t);
            break;
        case 4: /* sysContact */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
            od->v_len = *syscontact_len_ptr;
            break;
        case 5: /* sysName */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
            od->v_len = *sysname_len_ptr;
            break;
        case 6: /* sysLocation */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
            od->v_len = *syslocation_len_ptr;
            break;
        case 7: /* sysServices */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        default:
            LWIP_DEBUGF(SNMP_MIB_DEBUG, ("system_get_object_def: no such object\n"));
            od->instance = MIB_OBJECT_NONE;
            break;
        }
        ;
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("system_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

/**
 * Returns system object value.
 *
 * @param ident_len the address length (2)
 * @param ident points to objectname.0 (object id trailer)
 * @param len return value space (in bytes)
 * @param value points to (varbind) space to copy value into.
 */
static void
system_get_value(struct obj_def *od, u16_t len, void *value)
{
    u8_t id;

    id = od->id_inst_ptr[0];
    switch (id)
    {
    case 1: /* sysDescr */
        ocstrncpy(value, sysdescr_ptr, len);
        break;
    case 2: /* sysObjectID */
        objectidncpy((s32_t*)value, (s32_t*)sysobjid.id, (u8_t)(len / sizeof(s32_t)));
        break;
    case 3: /* sysUpTime */
    {
        snmp_get_sysuptime(value);
    }
    break;
    case 4: /* sysContact */
        ocstrncpy(value, syscontact_ptr, len);
        break;
    case 5: /* sysName */
        ocstrncpy(value, sysname_ptr, len);
        break;
    case 6: /* sysLocation */
        ocstrncpy(value, syslocation_ptr, len);
        break;
    case 7: /* sysServices */
    {
        s32_t *sint_ptr = value;
        *sint_ptr = sysservices;
    }
    break;
    }
    ;
}

static u8_t
system_set_test(struct obj_def *od, u16_t len, void *value)
{
    u8_t id, set_ok;

    LWIP_UNUSED_ARG(value);
    set_ok = 0;
    id = od->id_inst_ptr[0];
    switch (id)
    {
    case 4: /* sysContact */
        if ((syscontact_ptr != syscontact_default) &&
            (len <= 255))
        {
            set_ok = 1;
        }
        break;
    case 5: /* sysName */
        if ((sysname_ptr != sysname_default) &&
            (len <= 255))
        {
            set_ok = 1;
        }
        break;
    case 6: /* sysLocation */
        if ((syslocation_ptr != syslocation_default) &&
            (len <= 255))
        {
            set_ok = 1;
        }
        break;
    }
    ;
    return set_ok;
}

static void
system_set_value(struct obj_def *od, u16_t len, void *value)
{
    u8_t id;

    id = od->id_inst_ptr[0];
    switch (id)
    {
    case 4: /* sysContact */
        ocstrncpy(syscontact_ptr, value, len);
        *syscontact_len_ptr = len;
        break;
    case 5: /* sysName */
        ocstrncpy(sysname_ptr, value, len);
        *sysname_len_ptr = len;
        break;
    case 6: /* sysLocation */
        ocstrncpy(syslocation_ptr, value, len);
        *syslocation_len_ptr = len;
        break;
    }
    ;
}

/**
 * Returns interfaces.ifnumber object definition.
 *
 * @param ident_len the address length (2)
 * @param ident points to objectname.index
 * @param od points to object definition.
 */
static void
interfaces_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    /* return to object name, adding index depth (1) */
    ident_len += 1;
    ident -= 1;
    if (ident_len == 2)
    {
        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        od->instance = MIB_OBJECT_SCALAR;
        od->access = MIB_OBJECT_READ_ONLY;
        od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
        od->v_len = sizeof(s32_t);
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("interfaces_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

/**
 * Returns interfaces.ifnumber object value.
 *
 * @param ident_len the address length (2)
 * @param ident points to objectname.0 (object id trailer)
 * @param len return value space (in bytes)
 * @param value points to (varbind) space to copy value into.
 */
static void
interfaces_get_value(struct obj_def *od, u16_t len, void *value)
{
    LWIP_UNUSED_ARG(len);
    if (od->id_inst_ptr[0] == 1)
    {
        s32_t *sint_ptr = value;
        *sint_ptr = iflist_root.count;
    }
}

/**
 * Returns ifentry object definitions.
 *
 * @param ident_len the address length (2)
 * @param ident points to objectname.index
 * @param od points to object definition.
 */
static void
ifentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    u8_t id;

    /* return to object name, adding index depth (1) */
    ident_len += 1;
    ident -= 1;
    if (ident_len == 2)
    {
        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        id = ident[0];
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("get_object_def ifentry.%"U 16_F "\n", (u16_t)id));
        switch (id)
        {
        case 1: /* ifIndex */
        case 3: /* ifType */
        case 4: /* ifMtu */
        case 8: /* ifOperStatus */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        case 2: /* ifDescr */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
            /** @todo this should be some sort of sizeof(struct netif.name) */
            od->v_len = 2;
            break;
        case 5:  /* ifSpeed */
        case 21: /* ifOutQLen */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE);
            od->v_len = sizeof(u32_t);
            break;
        case 6: /* ifPhysAddress */
        {
            struct netif *netif;

            snmp_ifindextonetif(ident[1], &netif);
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
            od->v_len = netif->hwaddr_len;
        }
        break;
        case 7: /* ifAdminStatus */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        case 9: /* ifLastChange */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_TIMETICKS);
            od->v_len = sizeof(u32_t);
            break;
        case 10: /* ifInOctets */
        case 11: /* ifInUcastPkts */
        case 12: /* ifInNUcastPkts */
        case 13: /* ifInDiscarts */
        case 14: /* ifInErrors */
        case 15: /* ifInUnkownProtos */
        case 16: /* ifOutOctets */
        case 17: /* ifOutUcastPkts */
        case 18: /* ifOutNUcastPkts */
        case 19: /* ifOutDiscarts */
        case 20: /* ifOutErrors */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER);
            od->v_len = sizeof(u32_t);
            break;
        case 22: /* ifSpecific */
            /** @note returning zeroDotZero (0.0) no media specific MIB support */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID);
            od->v_len = ifspecific.len * sizeof(s32_t);
            break;
        default:
            LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ifentry_get_object_def: no such object\n"));
            od->instance = MIB_OBJECT_NONE;
            break;
        }
        ;
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ifentry_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

/**
 * Returns ifentry object value.
 *
 * @param ident_len the address length (2)
 * @param ident points to objectname.0 (object id trailer)
 * @param len return value space (in bytes)
 * @param value points to (varbind) space to copy value into.
 */
static void
ifentry_get_value(struct obj_def *od, u16_t len, void *value)
{
    struct netif *netif;
    u8_t id;

    snmp_ifindextonetif(od->id_inst_ptr[1], &netif);
    id = od->id_inst_ptr[0];
    switch (id)
    {
    case 1: /* ifIndex */
    {
        s32_t *sint_ptr = value;
        *sint_ptr = od->id_inst_ptr[1];
    }
    break;
    case 2: /* ifDescr */
        ocstrncpy(value, (u8_t*)netif->name, len);
        break;
    case 3: /* ifType */
    {
        s32_t *sint_ptr = value;
        *sint_ptr = netif->link_type;
    }
    break;
    case 4: /* ifMtu */
    {
        s32_t *sint_ptr = value;
        *sint_ptr = netif->mtu;
    }
    break;
    case 5: /* ifSpeed */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = netif->link_speed;
    }
    break;
    case 6: /* ifPhysAddress */
        ocstrncpy(value, netif->hwaddr, len);
        break;
    case 7: /* ifAdminStatus */
#if LWIP_NETIF_LINK_CALLBACK
        {
            s32_t *sint_ptr = value;
            if (netif_is_up(netif))
            {
                if (netif_is_link_up(netif))
                {
                    *sint_ptr = 1; /* up */
                }
                else
                {
                    *sint_ptr = 7; /* lowerLayerDown */
                }
            }
            else
            {
                *sint_ptr = 2; /* down */
            }
        }
        break;
#endif
    case 8: /* ifOperStatus */
    {
        s32_t *sint_ptr = value;
        if (netif_is_up(netif))
        {
            *sint_ptr = 1;
        }
        else
        {
            *sint_ptr = 2;
        }
    }
    break;
    case 9: /* ifLastChange */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = netif->ts;
    }
    break;
    case 10: /* ifInOctets */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = netif->ifinoctets;
    }
    break;
    case 11: /* ifInUcastPkts */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = netif->ifinucastpkts;
    }
    break;
    case 12: /* ifInNUcastPkts */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = netif->ifinnucastpkts;
    }
    break;
    case 13: /* ifInDiscarts */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = netif->ifindiscards;
    }
    break;
    case 14: /* ifInErrors */
    case 15: /* ifInUnkownProtos */
        /** @todo add these counters! */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = 0;
    }
    break;
    case 16: /* ifOutOctets */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = netif->ifoutoctets;
    }
    break;
    case 17: /* ifOutUcastPkts */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = netif->ifoutucastpkts;
    }
    break;
    case 18: /* ifOutNUcastPkts */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = netif->ifoutnucastpkts;
    }
    break;
    case 19: /* ifOutDiscarts */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = netif->ifoutdiscards;
    }
    break;
    case 20: /* ifOutErrors */
        /** @todo add this counter! */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = 0;
    }
    break;
    case 21: /* ifOutQLen */
        /** @todo figure out if this must be 0 (no queue) or 1? */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = 0;
    }
    break;
    case 22: /* ifSpecific */
        objectidncpy((s32_t*)value, (s32_t*)ifspecific.id, (u8_t)(len / sizeof(s32_t)));
        break;
    }
    ;
}

#if !SNMP_SAFE_REQUESTS
static u8_t
ifentry_set_test(struct obj_def *od, u16_t len, void *value)
{
    struct netif *netif;
    u8_t id, set_ok;

    set_ok = 0;
    snmp_ifindextonetif(od->id_inst_ptr[1], &netif);
    id = od->id_inst_ptr[0];
    switch (id)
    {
    case 7: /* ifAdminStatus */
    {
        s32_t *sint_ptr = value;
        if (*sint_ptr == 1 || *sint_ptr == 2)
        {
            set_ok = 1;
        }
    }
    break;
    }
    return set_ok;
}

static void
ifentry_set_value(struct obj_def *od, u16_t len, void *value)
{
    struct netif *netif;
    u8_t id;

    snmp_ifindextonetif(od->id_inst_ptr[1], &netif);
    id = od->id_inst_ptr[0];
    switch (id)
    {
    case 7: /* ifAdminStatus */
    {
        s32_t *sint_ptr = value;
        if (*sint_ptr == 1)
        {
            netif_set_up(netif);
        }
        else if (*sint_ptr == 2)
        {
            netif_set_down(netif);
        }
    }
    break;
    }
}
#endif /* SNMP_SAFE_REQUESTS */

/**
 * Returns atentry object definitions.
 *
 * @param ident_len the address length (6)
 * @param ident points to objectname.atifindex.atnetaddress
 * @param od points to object definition.
 */
static void
atentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    /* return to object name, adding index depth (5) */
    ident_len += 5;
    ident -= 5;

    if (ident_len == 6)
    {
        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        switch (ident[0])
        {
        case 1: /* atIfIndex */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        case 2: /* atPhysAddress */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
            od->v_len = 6; /** @todo try to use netif::hwaddr_len */
            break;
        case 3:            /* atNetAddress */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR);
            od->v_len = 4;
            break;
        default:
            LWIP_DEBUGF(SNMP_MIB_DEBUG, ("atentry_get_object_def: no such object\n"));
            od->instance = MIB_OBJECT_NONE;
            break;
        }
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("atentry_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

static void
atentry_get_value(struct obj_def *od, u16_t len, void *value)
{
#if LWIP_ARP
    u8_t id;
    struct eth_addr* ethaddr_ret;
    struct ip_addr* ipaddr_ret;
#endif /* LWIP_ARP */
    struct ip_addr ip;
    struct netif *netif;

    LWIP_UNUSED_ARG(len);
    LWIP_UNUSED_ARG(value); /* if !LWIP_ARP */

    snmp_ifindextonetif(od->id_inst_ptr[1], &netif);
    snmp_oidtoip(&od->id_inst_ptr[2], &ip);
    ip.addr = htonl(ip.addr);

#if LWIP_ARP /** @todo implement a netif_find_addr */
    if (etharp_find_addr(netif, &ip, &ethaddr_ret, &ipaddr_ret) > -1)
    {
        id = od->id_inst_ptr[0];
        switch (id)
        {
        case 1: /* atIfIndex */
        {
            s32_t *sint_ptr = value;
            *sint_ptr = od->id_inst_ptr[1];
        }
        break;
        case 2: /* atPhysAddress */
        {
            struct eth_addr *dst = value;

            *dst = *ethaddr_ret;
        }
        break;
        case 3: /* atNetAddress */
        {
            struct ip_addr *dst = value;

            *dst = *ipaddr_ret;
        }
        break;
        }
    }
#endif /* LWIP_ARP */
}

static void
ip_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    u8_t id;

    /* return to object name, adding index depth (1) */
    ident_len += 1;
    ident -= 1;
    if (ident_len == 2)
    {
        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        id = ident[0];
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("get_object_def ip.%"U 16_F ".0\n", (u16_t)id));
        switch (id)
        {
        case 1: /* ipForwarding */
        case 2: /* ipDefaultTTL */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        case 3:  /* ipInReceives */
        case 4:  /* ipInHdrErrors */
        case 5:  /* ipInAddrErrors */
        case 6:  /* ipForwDatagrams */
        case 7:  /* ipInUnknownProtos */
        case 8:  /* ipInDiscards */
        case 9:  /* ipInDelivers */
        case 10: /* ipOutRequests */
        case 11: /* ipOutDiscards */
        case 12: /* ipOutNoRoutes */
        case 14: /* ipReasmReqds */
        case 15: /* ipReasmOKs */
        case 16: /* ipReasmFails */
        case 17: /* ipFragOKs */
        case 18: /* ipFragFails */
        case 19: /* ipFragCreates */
        case 23: /* ipRoutingDiscards */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER);
            od->v_len = sizeof(u32_t);
            break;
        case 13: /* ipReasmTimeout */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        default:
            LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_get_object_def: no such object\n"));
            od->instance = MIB_OBJECT_NONE;
            break;
        }
        ;
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

static void
ip_get_value(struct obj_def *od, u16_t len, void *value)
{
    u8_t id;

    LWIP_UNUSED_ARG(len);
    id = od->id_inst_ptr[0];
    switch (id)
    {
    case 1: /* ipForwarding */
    {
        s32_t *sint_ptr = value;
#if IP_FORWARD
        /* forwarding */
        *sint_ptr = 1;
#else
        /* not-forwarding */
        *sint_ptr = 2;
#endif
    }
    break;
    case 2: /* ipDefaultTTL */
    {
        s32_t *sint_ptr = value;
        *sint_ptr = IP_DEFAULT_TTL;
    }
    break;
    case 3: /* ipInReceives */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipinreceives;
    }
    break;
    case 4: /* ipInHdrErrors */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipinhdrerrors;
    }
    break;
    case 5: /* ipInAddrErrors */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipinaddrerrors;
    }
    break;
    case 6: /* ipForwDatagrams */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipforwdatagrams;
    }
    break;
    case 7: /* ipInUnknownProtos */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipinunknownprotos;
    }
    break;
    case 8: /* ipInDiscards */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipindiscards;
    }
    break;
    case 9: /* ipInDelivers */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipindelivers;
    }
    break;
    case 10: /* ipOutRequests */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipoutrequests;
    }
    break;
    case 11: /* ipOutDiscards */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipoutdiscards;
    }
    break;
    case 12: /* ipOutNoRoutes */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipoutnoroutes;
    }
    break;
    case 13: /* ipReasmTimeout */
    {
        s32_t *sint_ptr = value;
#if IP_REASSEMBLY
        *sint_ptr = IP_REASS_MAXAGE;
#else
        *sint_ptr = 0;
#endif
    }
    break;
    case 14: /* ipReasmReqds */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipreasmreqds;
    }
    break;
    case 15: /* ipReasmOKs */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipreasmoks;
    }
    break;
    case 16: /* ipReasmFails */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipreasmfails;
    }
    break;
    case 17: /* ipFragOKs */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipfragoks;
    }
    break;
    case 18: /* ipFragFails */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipfragfails;
    }
    break;
    case 19: /* ipFragCreates */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = ipfragcreates;
    }
    break;
    case 23: /* ipRoutingDiscards */
        /** @todo can lwIP discard routes at all?? hardwire this to 0?? */
    {
        u32_t *uint_ptr = value;
        *uint_ptr = iproutingdiscards;
    }
    break;
    }
    ;
}

/**
 * Test ip object value before setting.
 *
 * @param od is the object definition
 * @param len return value space (in bytes)
 * @param value points to (varbind) space to copy value from.
 *
 * @note we allow set if the value matches the hardwired value,
 *   otherwise return badvalue.
 */
static u8_t
ip_set_test(struct obj_def *od, u16_t len, void *value)
{
    u8_t id, set_ok;
    s32_t *sint_ptr = value;

    LWIP_UNUSED_ARG(len);
    set_ok = 0;
    id = od->id_inst_ptr[0];
    switch (id)
    {
    case 1: /* ipForwarding */
#if IP_FORWARD
        /* forwarding */
        if (*sint_ptr == 1)
#else
        /* not-forwarding */
        if (*sint_ptr == 2)
#endif
        {
            set_ok = 1;
        }
        break;
    case 2: /* ipDefaultTTL */
        if (*sint_ptr == IP_DEFAULT_TTL)
        {
            set_ok = 1;
        }
        break;
    }
    ;
    return set_ok;
}

static void
ip_addrentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    /* return to object name, adding index depth (4) */
    ident_len += 4;
    ident -= 4;

    if (ident_len == 5)
    {
        u8_t id;

        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        id = ident[0];
        switch (id)
        {
        case 1: /* ipAdEntAddr */
        case 3: /* ipAdEntNetMask */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR);
            od->v_len = 4;
            break;
        case 2: /* ipAdEntIfIndex */
        case 4: /* ipAdEntBcastAddr */
        case 5: /* ipAdEntReasmMaxSize */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        default:
            LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_addrentry_get_object_def: no such object\n"));
            od->instance = MIB_OBJECT_NONE;
            break;
        }
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_addrentry_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

static void
ip_addrentry_get_value(struct obj_def *od, u16_t len, void *value)
{
    u8_t id;
    u16_t ifidx;
    struct ip_addr ip;
    struct netif *netif = netif_list;

    LWIP_UNUSED_ARG(len);
    snmp_oidtoip(&od->id_inst_ptr[1], &ip);
    ip.addr = htonl(ip.addr);
    ifidx = 0;
    while ((netif != NULL) && !ip_addr_cmp(&ip, &netif->ip_addr))
    {
        netif = netif->next;
        ifidx++;
    }

    if (netif != NULL)
    {
        id = od->id_inst_ptr[0];
        switch (id)
        {
        case 1: /* ipAdEntAddr */
        {
            struct ip_addr *dst = value;
            *dst = netif->ip_addr;
        }
        break;
        case 2: /* ipAdEntIfIndex */
        {
            s32_t *sint_ptr = value;
            *sint_ptr = ifidx + 1;
        }
        break;
        case 3: /* ipAdEntNetMask */
        {
            struct ip_addr *dst = value;
            *dst = netif->netmask;
        }
        break;
        case 4: /* ipAdEntBcastAddr */
        {
            s32_t *sint_ptr = value;

            /* lwIP oddity, there's no broadcast
               address in the netif we can rely on */
            *sint_ptr = ip_addr_broadcast.addr & 1;
        }
        break;
        case 5: /* ipAdEntReasmMaxSize */
        {
            s32_t *sint_ptr = value;
#if IP_REASSEMBLY
            /* @todo The theoretical maximum is IP_REASS_MAX_PBUFS * size of the pbufs,
             * but only if receiving one fragmented packet at a time.
             * The current solution is to calculate for 2 simultaneous packets...
             */
            *sint_ptr = (IP_HLEN + ((IP_REASS_MAX_PBUFS / 2) *
                                    (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN - IP_HLEN)));
#else
            /** @todo returning MTU would be a bad thing and
               returning a wild guess like '576' isn't good either */
            *sint_ptr = 0;
#endif
        }
        break;
        }
    }
}

/**
 * @note
 * lwIP IP routing is currently using the network addresses in netif_list.
 * if no suitable network IP is found in netif_list, the default_netif is used.
 */
static void
ip_rteentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    u8_t id;

    /* return to object name, adding index depth (4) */
    ident_len += 4;
    ident -= 4;

    if (ident_len == 5)
    {
        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        id = ident[0];
        switch (id)
        {
        case 1:  /* ipRouteDest */
        case 7:  /* ipRouteNextHop */
        case 11: /* ipRouteMask */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR);
            od->v_len = 4;
            break;
        case 2:  /* ipRouteIfIndex */
        case 3:  /* ipRouteMetric1 */
        case 4:  /* ipRouteMetric2 */
        case 5:  /* ipRouteMetric3 */
        case 6:  /* ipRouteMetric4 */
        case 8:  /* ipRouteType */
        case 10: /* ipRouteAge */
        case 12: /* ipRouteMetric5 */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        case 9: /* ipRouteProto */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        case 13: /* ipRouteInfo */
            /** @note returning zeroDotZero (0.0) no routing protocol specific MIB */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OBJ_ID);
            od->v_len = iprouteinfo.len * sizeof(s32_t);
            break;
        default:
            LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_rteentry_get_object_def: no such object\n"));
            od->instance = MIB_OBJECT_NONE;
            break;
        }
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_rteentry_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

static void
ip_rteentry_get_value(struct obj_def *od, u16_t len, void *value)
{
    struct netif *netif;
    struct ip_addr dest;
    s32_t *ident;
    u8_t id;

    ident = od->id_inst_ptr;
    snmp_oidtoip(&ident[1], &dest);
    dest.addr = htonl(dest.addr);

    if (dest.addr == 0)
    {
        /* ip_route() uses default netif for default route */
        netif = netif_default;
    }
    else
    {
        /* not using ip_route(), need exact match! */
        netif = netif_list;
        while ((netif != NULL) &&
               !ip_addr_netcmp(&dest, &(netif->ip_addr), &(netif->netmask)) )
        {
            netif = netif->next;
        }
    }
    if (netif != NULL)
    {
        id = ident[0];
        switch (id)
        {
        case 1: /* ipRouteDest */
        {
            struct ip_addr *dst = value;

            if (dest.addr == 0)
            {
                /* default rte has 0.0.0.0 dest */
                dst->addr = 0;
            }
            else
            {
                /* netifs have netaddress dest */
                dst->addr = netif->ip_addr.addr & netif->netmask.addr;
            }
        }
        break;
        case 2: /* ipRouteIfIndex */
        {
            s32_t *sint_ptr = value;

            snmp_netiftoifindex(netif, sint_ptr);
        }
        break;
        case 3: /* ipRouteMetric1 */
        {
            s32_t *sint_ptr = value;

            if (dest.addr == 0)
            {
                /* default rte has metric 1 */
                *sint_ptr = 1;
            }
            else
            {
                /* other rtes have metric 0 */
                *sint_ptr = 0;
            }
        }
        break;
        case 4:  /* ipRouteMetric2 */
        case 5:  /* ipRouteMetric3 */
        case 6:  /* ipRouteMetric4 */
        case 12: /* ipRouteMetric5 */
        {
            s32_t *sint_ptr = value;
            /* not used */
            *sint_ptr = -1;
        }
        break;
        case 7: /* ipRouteNextHop */
        {
            struct ip_addr *dst = value;

            if (dest.addr == 0)
            {
                /* default rte: gateway */
                *dst = netif->gw;
            }
            else
            {
                /* other rtes: netif ip_addr  */
                *dst = netif->ip_addr;
            }
        }
        break;
        case 8: /* ipRouteType */
        {
            s32_t *sint_ptr = value;

            if (dest.addr == 0)
            {
                /* default rte is indirect */
                *sint_ptr = 4;
            }
            else
            {
                /* other rtes are direct */
                *sint_ptr = 3;
            }
        }
        break;
        case 9: /* ipRouteProto */
        {
            s32_t *sint_ptr = value;
            /* locally defined routes */
            *sint_ptr = 2;
        }
        break;
        case 10: /* ipRouteAge */
        {
            s32_t *sint_ptr = value;
            /** @todo (sysuptime - timestamp last change) / 100
                @see snmp_insert_iprteidx_tree() */
            *sint_ptr = 0;
        }
        break;
        case 11: /* ipRouteMask */
        {
            struct ip_addr *dst = value;

            if (dest.addr == 0)
            {
                /* default rte use 0.0.0.0 mask */
                dst->addr = 0;
            }
            else
            {
                /* other rtes use netmask */
                *dst = netif->netmask;
            }
        }
        break;
        case 13: /* ipRouteInfo */
            objectidncpy((s32_t*)value, (s32_t*)iprouteinfo.id, (u8_t)(len / sizeof(s32_t)));
            break;
        }
    }
}

static void
ip_ntomentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    /* return to object name, adding index depth (5) */
    ident_len += 5;
    ident -= 5;

    if (ident_len == 6)
    {
        u8_t id;

        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        id = ident[0];
        switch (id)
        {
        case 1: /* ipNetToMediaIfIndex */
        case 4: /* ipNetToMediaType */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        case 2: /* ipNetToMediaPhysAddress */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_OC_STR);
            od->v_len = 6; /** @todo try to use netif::hwaddr_len */
            break;
        case 3:            /* ipNetToMediaNetAddress */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR);
            od->v_len = 4;
            break;
        default:
            LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_ntomentry_get_object_def: no such object\n"));
            od->instance = MIB_OBJECT_NONE;
            break;
        }
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("ip_ntomentry_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

static void
ip_ntomentry_get_value(struct obj_def *od, u16_t len, void *value)
{
#if LWIP_ARP
    u8_t id;
    struct eth_addr* ethaddr_ret;
    struct ip_addr* ipaddr_ret;
#endif /* LWIP_ARP */
    struct ip_addr ip;
    struct netif *netif;

    LWIP_UNUSED_ARG(len);
    LWIP_UNUSED_ARG(value); /* if !LWIP_ARP */

    snmp_ifindextonetif(od->id_inst_ptr[1], &netif);
    snmp_oidtoip(&od->id_inst_ptr[2], &ip);
    ip.addr = htonl(ip.addr);

#if LWIP_ARP /** @todo implement a netif_find_addr */
    if (etharp_find_addr(netif, &ip, &ethaddr_ret, &ipaddr_ret) > -1)
    {
        id = od->id_inst_ptr[0];
        switch (id)
        {
        case 1: /* ipNetToMediaIfIndex */
        {
            s32_t *sint_ptr = value;
            *sint_ptr = od->id_inst_ptr[1];
        }
        break;
        case 2: /* ipNetToMediaPhysAddress */
        {
            struct eth_addr *dst = value;

            *dst = *ethaddr_ret;
        }
        break;
        case 3: /* ipNetToMediaNetAddress */
        {
            struct ip_addr *dst = value;

            *dst = *ipaddr_ret;
        }
        break;
        case 4: /* ipNetToMediaType */
        {
            s32_t *sint_ptr = value;
            /* dynamic (?) */
            *sint_ptr = 3;
        }
        break;
        }
    }
#endif /* LWIP_ARP */
}

static void
icmp_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    /* return to object name, adding index depth (1) */
    ident_len += 1;
    ident -= 1;
    if ((ident_len == 2) &&
        (ident[0] > 0) && (ident[0] < 27))
    {
        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        od->instance = MIB_OBJECT_SCALAR;
        od->access = MIB_OBJECT_READ_ONLY;
        od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER);
        od->v_len = sizeof(u32_t);
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("icmp_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

static void
icmp_get_value(struct obj_def *od, u16_t len, void *value)
{
    u32_t *uint_ptr = value;
    u8_t id;

    LWIP_UNUSED_ARG(len);
    id = od->id_inst_ptr[0];
    switch (id)
    {
    case 1: /* icmpInMsgs */
        *uint_ptr = icmpinmsgs;
        break;
    case 2: /* icmpInErrors */
        *uint_ptr = icmpinerrors;
        break;
    case 3: /* icmpInDestUnreachs */
        *uint_ptr = icmpindestunreachs;
        break;
    case 4: /* icmpInTimeExcds */
        *uint_ptr = icmpintimeexcds;
        break;
    case 5: /* icmpInParmProbs */
        *uint_ptr = icmpinparmprobs;
        break;
    case 6: /* icmpInSrcQuenchs */
        *uint_ptr = icmpinsrcquenchs;
        break;
    case 7: /* icmpInRedirects */
        *uint_ptr = icmpinredirects;
        break;
    case 8: /* icmpInEchos */
        *uint_ptr = icmpinechos;
        break;
    case 9: /* icmpInEchoReps */
        *uint_ptr = icmpinechoreps;
        break;
    case 10: /* icmpInTimestamps */
        *uint_ptr = icmpintimestamps;
        break;
    case 11: /* icmpInTimestampReps */
        *uint_ptr = icmpintimestampreps;
        break;
    case 12: /* icmpInAddrMasks */
        *uint_ptr = icmpinaddrmasks;
        break;
    case 13: /* icmpInAddrMaskReps */
        *uint_ptr = icmpinaddrmaskreps;
        break;
    case 14: /* icmpOutMsgs */
        *uint_ptr = icmpoutmsgs;
        break;
    case 15: /* icmpOutErrors */
        *uint_ptr = icmpouterrors;
        break;
    case 16: /* icmpOutDestUnreachs */
        *uint_ptr = icmpoutdestunreachs;
        break;
    case 17: /* icmpOutTimeExcds */
        *uint_ptr = icmpouttimeexcds;
        break;
    case 18: /* icmpOutParmProbs */
        *uint_ptr = icmpoutparmprobs;
        break;
    case 19: /* icmpOutSrcQuenchs */
        *uint_ptr = icmpoutsrcquenchs;
        break;
    case 20: /* icmpOutRedirects */
        *uint_ptr = icmpoutredirects;
        break;
    case 21: /* icmpOutEchos */
        *uint_ptr = icmpoutechos;
        break;
    case 22: /* icmpOutEchoReps */
        *uint_ptr = icmpoutechoreps;
        break;
    case 23: /* icmpOutTimestamps */
        *uint_ptr = icmpouttimestamps;
        break;
    case 24: /* icmpOutTimestampReps */
        *uint_ptr = icmpouttimestampreps;
        break;
    case 25: /* icmpOutAddrMasks */
        *uint_ptr = icmpoutaddrmasks;
        break;
    case 26: /* icmpOutAddrMaskReps */
        *uint_ptr = icmpoutaddrmaskreps;
        break;
    }
}

#if LWIP_TCP
/** @todo tcp grp */
static void
tcp_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    u8_t id;

    /* return to object name, adding index depth (1) */
    ident_len += 1;
    ident -= 1;
    if (ident_len == 2)
    {
        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        id = ident[0];
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("get_object_def tcp.%"U 16_F ".0\n", (u16_t)id));

        switch (id)
        {
        case 1: /* tcpRtoAlgorithm */
        case 2: /* tcpRtoMin */
        case 3: /* tcpRtoMax */
        case 4: /* tcpMaxConn */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        case 5:  /* tcpActiveOpens */
        case 6:  /* tcpPassiveOpens */
        case 7:  /* tcpAttemptFails */
        case 8:  /* tcpEstabResets */
        case 10: /* tcpInSegs */
        case 11: /* tcpOutSegs */
        case 12: /* tcpRetransSegs */
        case 14: /* tcpInErrs */
        case 15: /* tcpOutRsts */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER);
            od->v_len = sizeof(u32_t);
            break;
        case 9: /* tcpCurrEstab */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_GAUGE);
            od->v_len = sizeof(u32_t);
            break;
        default:
            LWIP_DEBUGF(SNMP_MIB_DEBUG, ("tcp_get_object_def: no such object\n"));
            od->instance = MIB_OBJECT_NONE;
            break;
        }
        ;
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("tcp_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

static void
tcp_get_value(struct obj_def *od, u16_t len, void *value)
{
    u32_t *uint_ptr = value;
    s32_t *sint_ptr = value;
    u8_t id;

    LWIP_UNUSED_ARG(len);
    id = od->id_inst_ptr[0];
    switch (id)
    {
    case 1: /* tcpRtoAlgorithm, vanj(4) */
        *sint_ptr = 4;
        break;
    case 2: /* tcpRtoMin */
        /* @todo not the actual value, a guess,
            needs to be calculated */
        *sint_ptr = 1000;
        break;
    case 3: /* tcpRtoMax */
        /* @todo not the actual value, a guess,
           needs to be calculated */
        *sint_ptr = 60000;
        break;
    case 4: /* tcpMaxConn */
        *sint_ptr = MEMP_NUM_TCP_PCB;
        break;
    case 5: /* tcpActiveOpens */
        *uint_ptr = tcpactiveopens;
        break;
    case 6: /* tcpPassiveOpens */
        *uint_ptr = tcppassiveopens;
        break;
    case 7: /* tcpAttemptFails */
        *uint_ptr = tcpattemptfails;
        break;
    case 8: /* tcpEstabResets */
        *uint_ptr = tcpestabresets;
        break;
    case 9: /* tcpCurrEstab */
    {
        u16_t tcpcurrestab = 0;
        struct tcp_pcb *pcb = tcp_active_pcbs;
        while (pcb != NULL)
        {
            if ((pcb->state == ESTABLISHED) ||
                (pcb->state == CLOSE_WAIT))
            {
                tcpcurrestab++;
            }
            pcb = pcb->next;
        }
        *uint_ptr = tcpcurrestab;
    }
    break;
    case 10: /* tcpInSegs */
        *uint_ptr = tcpinsegs;
        break;
    case 11: /* tcpOutSegs */
        *uint_ptr = tcpoutsegs;
        break;
    case 12: /* tcpRetransSegs */
        *uint_ptr = tcpretranssegs;
        break;
    case 14: /* tcpInErrs */
        *uint_ptr = tcpinerrs;
        break;
    case 15: /* tcpOutRsts */
        *uint_ptr = tcpoutrsts;
        break;
    }
}
#ifdef THIS_SEEMS_UNUSED
static void
tcpconnentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    /* return to object name, adding index depth (10) */
    ident_len += 10;
    ident -= 10;

    if (ident_len == 11)
    {
        u8_t id;

        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        id = ident[0];
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("get_object_def tcp.%"U 16_F ".0\n", (u16_t)id));

        switch (id)
        {
        case 1: /* tcpConnState */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        case 2: /* tcpConnLocalAddress */
        case 4: /* tcpConnRemAddress */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR);
            od->v_len = 4;
            break;
        case 3: /* tcpConnLocalPort */
        case 5: /* tcpConnRemPort */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        default:
            LWIP_DEBUGF(SNMP_MIB_DEBUG, ("tcpconnentry_get_object_def: no such object\n"));
            od->instance = MIB_OBJECT_NONE;
            break;
        }
        ;
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("tcpconnentry_get_object_def: no such object\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

static void
tcpconnentry_get_value(struct obj_def *od, u16_t len, void *value)
{
    struct ip_addr lip, rip;
    u16_t lport, rport;
    s32_t *ident;

    ident = od->id_inst_ptr;
    snmp_oidtoip(&ident[1], &lip);
    lip.addr = htonl(lip.addr);
    lport = ident[5];
    snmp_oidtoip(&ident[6], &rip);
    rip.addr = htonl(rip.addr);
    rport = ident[10];

    /** @todo find matching PCB */
}
#endif /* if 0 */
#endif

static void
udp_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    /* return to object name, adding index depth (1) */
    ident_len += 1;
    ident -= 1;
    if ((ident_len == 2) &&
        (ident[0] > 0) && (ident[0] < 6))
    {
        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        od->instance = MIB_OBJECT_SCALAR;
        od->access = MIB_OBJECT_READ_ONLY;
        od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER);
        od->v_len = sizeof(u32_t);
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("udp_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

static void
udp_get_value(struct obj_def *od, u16_t len, void *value)
{
    u32_t *uint_ptr = value;
    u8_t id;

    LWIP_UNUSED_ARG(len);
    id = od->id_inst_ptr[0];
    switch (id)
    {
    case 1: /* udpInDatagrams */
        *uint_ptr = udpindatagrams;
        break;
    case 2: /* udpNoPorts */
        *uint_ptr = udpnoports;
        break;
    case 3: /* udpInErrors */
        *uint_ptr = udpinerrors;
        break;
    case 4: /* udpOutDatagrams */
        *uint_ptr = udpoutdatagrams;
        break;
    }
}

static void
udpentry_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    /* return to object name, adding index depth (5) */
    ident_len += 5;
    ident -= 5;

    if (ident_len == 6)
    {
        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        switch (ident[0])
        {
        case 1: /* udpLocalAddress */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_IPADDR);
            od->v_len = 4;
            break;
        case 2: /* udpLocalPort */
            od->instance = MIB_OBJECT_TAB;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        default:
            LWIP_DEBUGF(SNMP_MIB_DEBUG, ("udpentry_get_object_def: no such object\n"));
            od->instance = MIB_OBJECT_NONE;
            break;
        }
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("udpentry_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

static void
udpentry_get_value(struct obj_def *od, u16_t len, void *value)
{
    u8_t id;
    struct udp_pcb *pcb;
    struct ip_addr ip;
    u16_t port;

    LWIP_UNUSED_ARG(len);
    snmp_oidtoip(&od->id_inst_ptr[1], &ip);
    ip.addr = htonl(ip.addr);
    port = od->id_inst_ptr[5];

    pcb = udp_pcbs;
    while ((pcb != NULL) &&
           !((pcb->local_ip.addr == ip.addr) &&
             (pcb->local_port == port)))
    {
        pcb = pcb->next;
    }

    if (pcb != NULL)
    {
        id = od->id_inst_ptr[0];
        switch (id)
        {
        case 1: /* udpLocalAddress */
        {
            struct ip_addr *dst = value;
            *dst = pcb->local_ip;
        }
        break;
        case 2: /* udpLocalPort */
        {
            s32_t *sint_ptr = value;
            *sint_ptr = pcb->local_port;
        }
        break;
        }
    }
}

static void
snmp_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od)
{
    /* return to object name, adding index depth (1) */
    ident_len += 1;
    ident -= 1;
    if (ident_len == 2)
    {
        u8_t id;

        od->id_inst_len = ident_len;
        od->id_inst_ptr = ident;

        id = ident[0];
        switch (id)
        {
        case 1:  /* snmpInPkts */
        case 2:  /* snmpOutPkts */
        case 3:  /* snmpInBadVersions */
        case 4:  /* snmpInBadCommunityNames */
        case 5:  /* snmpInBadCommunityUses */
        case 6:  /* snmpInASNParseErrs */
        case 8:  /* snmpInTooBigs */
        case 9:  /* snmpInNoSuchNames */
        case 10: /* snmpInBadValues */
        case 11: /* snmpInReadOnlys */
        case 12: /* snmpInGenErrs */
        case 13: /* snmpInTotalReqVars */
        case 14: /* snmpInTotalSetVars */
        case 15: /* snmpInGetRequests */
        case 16: /* snmpInGetNexts */
        case 17: /* snmpInSetRequests */
        case 18: /* snmpInGetResponses */
        case 19: /* snmpInTraps */
        case 20: /* snmpOutTooBigs */
        case 21: /* snmpOutNoSuchNames */
        case 22: /* snmpOutBadValues */
        case 24: /* snmpOutGenErrs */
        case 25: /* snmpOutGetRequests */
        case 26: /* snmpOutGetNexts */
        case 27: /* snmpOutSetRequests */
        case 28: /* snmpOutGetResponses */
        case 29: /* snmpOutTraps */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_ONLY;
            od->asn_type = (SNMP_ASN1_APPLIC | SNMP_ASN1_PRIMIT | SNMP_ASN1_COUNTER);
            od->v_len = sizeof(u32_t);
            break;
        case 30: /* snmpEnableAuthenTraps */
            od->instance = MIB_OBJECT_SCALAR;
            od->access = MIB_OBJECT_READ_WRITE;
            od->asn_type = (SNMP_ASN1_UNIV | SNMP_ASN1_PRIMIT | SNMP_ASN1_INTEG);
            od->v_len = sizeof(s32_t);
            break;
        default:
            LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_get_object_def: no such object\n"));
            od->instance = MIB_OBJECT_NONE;
            break;
        }
        ;
    }
    else
    {
        LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_get_object_def: no scalar\n"));
        od->instance = MIB_OBJECT_NONE;
    }
}

static void
snmp_get_value(struct obj_def *od, u16_t len, void *value)
{
    u32_t *uint_ptr = value;
    u8_t id;

    LWIP_UNUSED_ARG(len);
    id = od->id_inst_ptr[0];
    switch (id)
    {
    case 1:   /* snmpInPkts */
        *uint_ptr = snmpinpkts;
        break;
    case 2:   /* snmpOutPkts */
        *uint_ptr = snmpoutpkts;
        break;
    case 3:   /* snmpInBadVersions */
        *uint_ptr = snmpinbadversions;
        break;
    case 4:   /* snmpInBadCommunityNames */
        *uint_ptr = snmpinbadcommunitynames;
        break;
    case 5:   /* snmpInBadCommunityUses */
        *uint_ptr = snmpinbadcommunityuses;
        break;
    case 6:   /* snmpInASNParseErrs */
        *uint_ptr = snmpinasnparseerrs;
        break;
    case 8:   /* snmpInTooBigs */
        *uint_ptr = snmpintoobigs;
        break;
    case 9:   /* snmpInNoSuchNames */
        *uint_ptr = snmpinnosuchnames;
        break;
    case 10:   /* snmpInBadValues */
        *uint_ptr = snmpinbadvalues;
        break;
    case 11:   /* snmpInReadOnlys */
        *uint_ptr = snmpinreadonlys;
        break;
    case 12:   /* snmpInGenErrs */
        *uint_ptr = snmpingenerrs;
        break;
    case 13:   /* snmpInTotalReqVars */
        *uint_ptr = snmpintotalreqvars;
        break;
    case 14:   /* snmpInTotalSetVars */
        *uint_ptr = snmpintotalsetvars;
        break;
    case 15:   /* snmpInGetRequests */
        *uint_ptr = snmpingetrequests;
        break;
    case 16:   /* snmpInGetNexts */
        *uint_ptr = snmpingetnexts;
        break;
    case 17:   /* snmpInSetRequests */
        *uint_ptr = snmpinsetrequests;
        break;
    case 18:   /* snmpInGetResponses */
        *uint_ptr = snmpingetresponses;
        break;
    case 19:   /* snmpInTraps */
        *uint_ptr = snmpintraps;
        break;
    case 20:   /* snmpOutTooBigs */
        *uint_ptr = snmpouttoobigs;
        break;
    case 21:   /* snmpOutNoSuchNames */
        *uint_ptr = snmpoutnosuchnames;
        break;
    case 22:   /* snmpOutBadValues */
        *uint_ptr = snmpoutbadvalues;
        break;
    case 24:   /* snmpOutGenErrs */
        *uint_ptr = snmpoutgenerrs;
        break;
    case 25:   /* snmpOutGetRequests */
        *uint_ptr = snmpoutgetrequests;
        break;
    case 26:   /* snmpOutGetNexts */
        *uint_ptr = snmpoutgetnexts;
        break;
    case 27:   /* snmpOutSetRequests */
        *uint_ptr = snmpoutsetrequests;
        break;
    case 28:   /* snmpOutGetResponses */
        *uint_ptr = snmpoutgetresponses;
        break;
    case 29:   /* snmpOutTraps */
        *uint_ptr = snmpouttraps;
        break;
    case 30:   /* snmpEnableAuthenTraps */
        *uint_ptr = *snmpenableauthentraps_ptr;
        break;
    }
    ;
}

/**
 * Test snmp object value before setting.
 *
 * @param od is the object definition
 * @param len return value space (in bytes)
 * @param value points to (varbind) space to copy value from.
 */
static u8_t
snmp_set_test(struct obj_def *od, u16_t len, void *value)
{
    u8_t id, set_ok;

    LWIP_UNUSED_ARG(len);
    set_ok = 0;
    id = od->id_inst_ptr[0];
    if (id == 30)
    {
        /* snmpEnableAuthenTraps */
        s32_t *sint_ptr = value;

        if (snmpenableauthentraps_ptr != &snmpenableauthentraps_default)
        {
            /* we should have writable non-volatile mem here */
            if ((*sint_ptr == 1) || (*sint_ptr == 2))
            {
                set_ok = 1;
            }
        }
        else
        {
            /* const or hardwired value */
            if (*sint_ptr == snmpenableauthentraps_default)
            {
                set_ok = 1;
            }
        }
    }
    return set_ok;
}

static void
snmp_set_value(struct obj_def *od, u16_t len, void *value)
{
    u8_t id;

    LWIP_UNUSED_ARG(len);
    id = od->id_inst_ptr[0];
    if (id == 30)
    {
        /* snmpEnableAuthenTraps */
        s32_t *sint_ptr = value;
        *snmpenableauthentraps_ptr = *sint_ptr;
    }
}

#endif /* LWIP_SNMP */
